Try the "hammered" paints from Rustoleum. I have been working on a technique using a base coat of hammered with a overspray of other paints. Looks really wild. Try one of the dark "hammered" paints laying down a good thick coat. As soon as you finish it will start to swirl around as it moves to the hammered look, at that time spray a fairly light but even coat over it and the effect will be a spider web appearrance. Just make sure you seal any plastic parts with a good primer because for some reason the hammered paint will stay soft after drying if it is over bare plastic and do not use enamels over the hammered paint, they just sink through and give a skid paint effect like if you added sand. Metalics work the best. I practice on old PS covers, it takes practice to get this technique down right. Good Luck.